Malicious PDF — malware analysis report

Static analysis result for SHA-256 e834e1e6fb46454f…

MALICIOUS

PDF

83.7 KB Created: 2021-06-28 09:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c4a2fe73f2a44f3a6890c924c21ab4fc SHA-1: 7beb795441854af317164547a614bff4b10dd721 SHA-256: e834e1e6fb46454f2d0fc3a923cdec914cb79e04479934cfa7d863710f788b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a trojan or phishing lure. It functions as a link farm, directing users to multiple compromised WordPress sites hosting further PDF documents. This suggests an attempt to manipulate search engine results or distribute additional malicious content through a chain of compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da288e8aa---99067395697.pdf In PDF document text
    • http://www.abcklima.hu//data/editorfile/87415933174.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/napulurubetojubu.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/44121113520.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/8cc6efa658a45800ec559ff7127a5ac1/sopirupiguvozobosolel.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/17527807436.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/14287686209.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/33319320504.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3d85a21e0e3aecc825ef78600685112e/xamunagigag.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qu1p9h0c2eukq4opt4csi12or2/6661638255.pdfIn PDF document text
    • http://sun-tes.ru/files/file/rizapinaxelibobaxufo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b01d37cd---kuxelewakuxobi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/959d59262ce57db2756dce5be0e442e8/tolabegakemejumu.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/lelesejifetigazezaxewug.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/90740812218.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5322fa73---56972323269.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/firesejumugetajodivab.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160819eda50baf---42266437642.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/jemokepo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1ei19r0v5bui1dpe8nltf55j7g/40845509224.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d9ff669d92ef9724ced83e67356a3bac/25935698778.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5b29e328597e5d903a6794bec10905ed/22474204642.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071040970a07---wamoxugoburagoditaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=17000+white+blood+cell+countPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 15960 bytes
SHA-256: ce26931f880f59572ad86501db31352f939b5ccbcf3aeaed7b4b01854fdd027c
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 10488 bytes
SHA-256: 7ede26e0e550d39f5515541eb16ff3953038aaf7b57a504cf9b0e166877585a3

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